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Aluminum salt lithium adsorbent, and preparation method and application thereof

A lithium adsorption and aluminum salt technology, applied in chemical instruments and methods, other chemical processes, etc., to achieve the effect of simple reaction process, high selectivity, and large adsorption capacity

Active Publication Date: 2018-12-14
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The currently reported adsorbents have the largest adsorption capacity of the aluminum salt resin compound produced by Dow in the United States and the aluminum salt adsorbent in Russia, but their working adsorption capacity is only about 2-3 mg / g, which still needs to be improved.

Method used

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  • Aluminum salt lithium adsorbent, and preparation method and application thereof
  • Aluminum salt lithium adsorbent, and preparation method and application thereof
  • Aluminum salt lithium adsorbent, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weigh 24g AlCl 3 ·6H 2 O and 4.5g LiCl·H 2 O was dissolved in 30ml of deionized water, the Li / Al molar ratio was 1.5 / 2, the lithium solution concentration was 0.07mol / L, the aluminum solution concentration was 0.1mol / L, and the aluminum chloride and lithium chloride solutions were heated at 75°C. After ultrasonication for 60 minutes, mix evenly. Lithium-aluminum mixed solution and 6mol / L 50ml ammonia water are added dropwise to the reaction kettle at a rate of 15ml / min. The volume ratio of lithium-aluminum mixed solution to ammonia water is 1:1, and the stirring speed is 150rpm, the whole reaction is controlled by a circulating water bath at 90°C, and the pH value at the end of the dropwise addition is controlled to be 7. After the end, it is left to age for 24 hours at a temperature of 90°C. After aging, the reaction system was transferred to a 1L polytetrafluoroethylene hydrothermal kettle, and hydrothermally reacted at 160°C for 24h to obtain LiCl·aAl(OH) 3 ·nH 2...

Embodiment 2

[0043] Weigh 40g Al(NO 3 ) 3 9H 2 O and 4.8g LiNO 3 Dissolve in 50ml of deionized water, the Li / Al molar ratio is 1.3 / 2, the lithium solution concentration is 0.7mol / L, the aluminum solution concentration is 1.1mol / L, and the aluminum nitrate and lithium nitrate solutions are ultrasonicated at 65°C for 30min Mix evenly, the lithium-aluminum mixed solution is added dropwise in the 40ml sodium hydroxide solution of 8mol / L with the drop rate of 15ml / min, the volume ratio of lithium-aluminum mixed solution and alkaline solution is 1:1, and stirring speed is 150rpm, and the whole reaction consists of The circulating water bath was controlled at 90°C, and the pH value at the end of the dropwise addition was controlled to be 7. After the end, the mixture was aged at 90°C for 24 hours. After aging, the reaction system was transferred to a 1L polytetrafluoroethylene hydrothermal kettle, and hydrothermally reacted at 160°C for 24h to obtain LiCl·aAl(OH) 3 ·nH 2 The O precursor was ...

Embodiment 3

[0046] Weigh 34g Al 2 (SO 4 ) 3 and 4.4g Li 2 SO 4 Dissolve in 200ml of deionized water, the Li / Al molar ratio is 0.8 / 2, the lithium solution concentration is 0.40mol / L, the aluminum solution concentration is 1.0mol / L, and the aluminum sulfate and lithium sulfate solutions are ultrasonicated at 65°C for 30min Mix evenly, the lithium-aluminum mixed solution and 99.4ml sodium metaaluminate solution of 6mol / L are added dropwise to the reaction kettle at a rate of 15ml / min, the volume ratio of the lithium-aluminum mixed solution to the sodium metaaluminate solution is 2 : 1, the stirring speed is 150rpm, the whole reaction is carried out under the control of a circulating water bath at 50°C, the pH value at the end of the dropwise addition is controlled to be 5.5, and after the end, the temperature is left to stand for 24h under the condition of 50°C. After aging, the reaction system was transferred to a 1L polytetrafluoroethylene hydrothermal kettle, and hydrothermally reacte...

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Abstract

The invention discloses an aluminum salt lithium adsorbent with the molecular formula of LiCl.aAl(OH)3.nH2O, wherein a is 2-5 and n is 0.5-10. The invention also discloses a preparation method of thealuminum salt lithium adsorbent, wherein the preparation method comprises the following steps: mixing an aluminum salt and a lithium salt, then dissolving into deionized water, fully mixing evenly with ultrasound, and then dropwise adding the mixed solution into an alkali solution, or dropwise adding an alkali solution into the mixed solution, or dropwise adding the mixed solution and an alkali solution into a reaction kettle in a manner of parallel flow; and controlling the pH, aging, carrying out hydrothermal reaction, filtering, washing, vacuum-drying, washing with water, and drying to obtain the aluminum salt lithium adsorbent. The invention also discloses an application of the aluminum salt lithium adsorbent in adsorbing lithium in a lithium-containing solution. The prepared aluminumsalt lithium adsorbent has the advantages of stable property, large adsorption capacity, good repeatability and high selectivity.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic adsorbents, in particular to an aluminum salt lithium adsorbent and its preparation method and application. Background technique [0002] Lithium is the lightest metal in the world and is widely used in many fields due to its special physical and chemical properties. Most of the lithium resources in the world are stored in salt lakes (seawater), and how to effectively extract lithium from salt lakes has become an urgent problem to be solved. [0003] Before the mid-1980s, countries around the world mainly used lithium ore as raw material to produce lithium salt. This method has a long history and a relatively mature process, but its energy consumption is high, which will pollute the environment to a certain extent, and lithium ore resources are increasingly scarce, showing its limitations. On the other hand, lithium resources in salt lake brines are abundant, and the cost is low...

Claims

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Application Information

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IPC IPC(8): B01J20/08B01J20/30C22B26/12
CPCB01J20/046B01J20/08C22B26/12
Inventor 林森钟静胡放平宋兴福于建国
Owner EAST CHINA UNIV OF SCI & TECH
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